[Repeater-Builder] Choosing Commercial UHF Repeater
I suspect that many of the participants here have had experience selecting UHF repeaters for high-RF applications such as at broadcasting sites. Which would you buy and why? Yaesu/Vertex, ICOM, Kenwood, or some Motorola type? At present I am using a pair of Moto GM300s with a RICK controller. Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Choosing Commercial UHF Repeater
well the best one I like is the Kenwood TKR-840 as we use them for a number of UHF sites. the mate is the TKR-740 VHF thanks John - Original Message - From: mbloom0947 [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, February 21, 2005 2:00 PM Subject: [Repeater-Builder] Choosing Commercial UHF Repeater I suspect that many of the participants here have had experience selecting UHF repeaters for high-RF applications such as at broadcasting sites. Which would you buy and why? Yaesu/Vertex, ICOM, Kenwood, or some Motorola type? At present I am using a pair of Moto GM300s with a RICK controller. Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Choosing Commercial UHF Repeater
Hello All, The Kenwood TKR-840 is a fine repeater. But I have noted that most of the Hams seem to buy the Kenwood TKR-850 and they work very well. We have a Ham who has a Maggiore High pro at one of our tower site that is very high RF and works well. We have a 50,000 watt FM broadcast station, a digital TV station that I have no clue what it puts out. 3 cell carriers, 9 trunking systems some 800 some 900 and a new 460 5 channel trunk. The Ham repeater is in a rack right next to and in the same room as this whole mess. It has a TX/RX duplexer and circulator. No fancy stuff just the repeater and a 1200 MHz duplex link. Seems to do just fine. The antenna is a DB-420 about 50 feet below the FM broadcast antenna. Very Best, Dean Westbrook, EE,PE. Yahoo! Groups Links To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Choosing Commercial UHF Repeater
Perhaps the best answer is to see what the public-safety agencies use at sites with several dozen UHF repeaters within a few hundred meters. In my area of Central California, the most common repeaters are Motorola Quantar and MTR2000, or Kenwood TKR-840. The brand of the repeater used is driven by the brand of mobile and portable radios being used, since a Kenwood mobile radio will not mute quietly on a Motorola repeater, and (except for the Professional Series radios) vice-versa. While many GE, Vertex, and Icom radios will mute quietly on a Kenwood repeater, that is not a given. While selecting top-quality equipment is important, there is a great deal of engineering that must go into the design of a repeater at a dense site. Logical placement of antennas is important; you don't want to put your antenna right next to an antenna that has a harmonic or subharmonic relationship to yours. My personal preference is to use large-diameter cavity bandpass filters on both RX and TX, double or triple ferrite circulators on TX, and nothing but double-shielded cable or hardline throughout. The Number One Rule is that nothing but an on-frequency signal can get into my receiver, and nothing but an on-frequency signal leaves my transmitter. In an ideal world, all of the repeaters at a dense site would be designed to follow this Rule. Alas, such is not the case... 73, Eric Lemmon WB6FLY mbloom0947 wrote: I suspect that many of the participants here have had experience selecting UHF repeaters for high-RF applications such as at broadcasting sites. Which would you buy and why? Yaesu/Vertex, ICOM, Kenwood, or some Motorola type? At present I am using a pair of Moto GM300s with a RICK controller. Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
